C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

o2 sensor fitting

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Old Sep 24, 2005 | 12:44 PM
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Default o2 sensor fitting

Can anyone tell me what size thread a o2 sensor is . Mine was cross threaded slightly and would like to chase it with a tap to clean it up.
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Old Sep 24, 2005 | 02:02 PM
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NTK has two common sizes: M18 (Zirconia sensor style) and
M12 (Titania sensor style)

You don't mention the application but my money is on the M18
being the size you are interested in.

.
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Old Sep 24, 2005 | 03:02 PM
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Using a AC delco O2 from a 92 350 TPI engine....
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Old Sep 24, 2005 | 03:04 PM
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I believe it's M18x1.5.
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Old Sep 24, 2005 | 03:33 PM
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It IS M18X1.5

RACE ON!!!
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Old Sep 24, 2005 | 04:09 PM
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Is this a size Sears or local store should have or do I need to order one
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Old Sep 24, 2005 | 04:44 PM
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I don't have my Sears inventory sheets handy, but that used to be a semi common spark plug size. It was fairly often used by Ford. I don't see your location posted below your avatar, so I don't know if you are in a metropolitan area or in the sticks. Industrial supply stores are another source.

RACE ON!!!
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Old Sep 24, 2005 | 06:24 PM
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Great, never even thought of spark plug chaser, Sometimes you overlook the simple By the way Im a suburb of Chicago......
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Old Sep 24, 2005 | 06:40 PM
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Originally Posted by CFI-EFI
I don't have my Sears inventory sheets handy, but that used to be a semi common spark plug size. It was fairly often used by Ford. I don't see your location posted below your avatar, so I don't know if you are in a metropolitan area or in the sticks. Industrial supply stores are another source.

RACE ON!!!
That's what it is. Most spark plugs are 14 mm these days but 18 mm used to be very common and that's what the C4s O2s are..
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Old Sep 24, 2005 | 07:52 PM
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Originally Posted by toyvet1
By the way Im a suburb of Chicago......
DAMN! You must be big. Do you have your own Zip code? Sorry, I couldn't resist.
I used to live in one of the northern 'burbs.

RACE ON!!!
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Old Sep 25, 2005 | 02:25 AM
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Yes I am on the large side but have not been able to convince the post office to issue me a zip of my own........
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Old Sep 25, 2005 | 12:50 PM
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Great help guys, bought a spark plug chaser and it works like new...
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